def catch_known_errors(f, *a, **kw):
"""Decorator that catches known api errors
.. versionadded: 0.5.4
"""
try:
return f(*a, **kw)
except exceptions.PathFoundError, e:
raise exceptions.KnownError("The path %s already exists" % e.args[0])
def _migrate_version(schema, version, upgrade, err):
if version is None:
return version
# Version is specified: ensure we're upgrading in the right direction
# (current version < target version for upgrading; reverse for down)
version = VerNum(version)
cur = schema.version
if upgrade is not None:
if upgrade:
direction = cur <= version
else:
direction = cur >= version
if not direction:
raise exceptions.KnownError(err % (cur, version))
return version